This system is mainly composed of Alpha frequency converter, Delta PLC DVP-14ES, and Weiluntong touch screen MT8050I.
I. Overview
Delta DVP-14ES PLC has two communication ports COM1, COM2, COM1 can be used to download programs or RS232 communication, COM2 supports RS485 MODBUS communication.
Weiluntong touch screen MT8050I has a 9-pin communication port, but this port can be used for RS232 communication or RS485 2W communication. These all need to be configured in Weiluntong's own software EB8000 Project Manager.
Alpha frequency converter mainly supports RS485 communication of MODBUS-RTU.
2. Working principle
Due to the DC24V power supply for the MT8050I touch screen, we need a switching power supply that can convert AC220V voltage to DC24V voltage. Delta PLC DVP-14ES is directly supplied by AC220V voltage source.
3. System configuration
Communication line production
The COM1 port of Delta PLC DVP-14ES is an 8-pin DIN round foreman, and the communication port of Weiluntong MT8050I is a 9-pin D-shaped port. Since the port definition of MT8050I is not standard, we must make our own download line.
The MT8050I port definition is shown in the following table:
It can be seen from the figure that COM1 can do RS485 2W (2-wire) communication, RS485 4W (4-wire), and RS232 communication. In RS232 communication, 6——TXD, 9——RXD, 5——GND.
The RS232 communication pins of Delta PLC DVP-14ES are defined as: 5-TXD, 4-RXD, 8-GND.
The arrangement of the 8-pin DIN round female pin is as shown in the figure below:
The connection of the communication line is shown below:
Four, system advantages
The 6000 series is a magnetic flux vector inverter, which has the following main features:
1) Advanced software algorithm and high control accuracy
2) Good low frequency characteristics, torque can be automatically increased
3) Strong overload capacity, up to 200% overload current
4) The running curve can be customized according to the load requirements
5) The running curve can be customized according to the load requirements
6) Excellent product technology, adapt to the harsh industrial environment
It must be noted here that the Delta PLC defaults to ASCII and the data length is 7, and cannot be changed to 8-bit or RTU mode here, otherwise the program cannot be downloaded into the PLC!